<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    /* 背景叠加 */
    .container{
      position: relative;
      width: 662px;
      height: 18px;
    }
    .item1{
      position: absolute;
      width: 662px;
      height: 18px;
      background: url('./2.png') no-repeat;
      background-size: 100% 100%;
      z-index: 1;
    }
    .item2{
      position: absolute;
      width: 662px;
      height: 18px;
      background: url('./2.png') no-repeat;
      background-size: 662px 18px;

      z-index: 2;
      background-blend-mode: multiply; 
    }
  </style>
</head>
<body>
  <div class="container">
    <div class="item1"></div>
    <div class='item2'></div>
  </div>
  
</body>
</html>